Rocker arms are removed by removing the adjusting nut. Be sure to adjust the valve lash after replacing the rocker arms. Coat the replacement rocker arm and ball with an engine assembly lubricant before installation.

Rocker arm studs that have damaged threads or are loose in the cylinder heads may be replaced by reaming the bore and installing oversize studs. Oversizes available are 0.003 and 0.013 inch. The bores may also be tapped and screw-in studs installed. Several aftermarket companies produce complete rocker arm stud kits with installation tools.

Diesel Engine

Remove the rocker arm covers.

Remove the rocker arm and shaft.

If the rocker arm is to be removed, remove the cotter pin and then remove the rocker arm from the shaft.

Lift out the pushrods. The pushrod upper end must be marked for reinstallation.

To install:

Install the pushrods if removed. Make sure that the marked end is up, failure to do so could cause premature wear or damage.

Install the rocker arms and spring onto the shaft in the proper order.